24,925 research outputs found
Delta-aminolaevulinic acid mediated photodynamic antimicrobial chemotherapy on Pseudomonas aeruginosa planktonic and biofilm cultures.
No full textApplication of CT in Diagnosing Carcinoma of the Maxillary Sinuses : PART 2: An Experimental Study of Pitfalls Encountered when Diagnosing Carcinoma of the Maxillary Sinuses with CT
Full text link1982-03A phantom simulating the transverse section of the maxillary sinuses was constructed for experimentation with various CT scanners to study the following: (1) the occasional inability to image the very thin posterior-lateral walls which have no real bone defects, and (2) to verify whether or not the bony walls surrounding the maxillary sinuses are actually as thick as they appear on CT. The phantom was made of an acrylic cylinder containing three cavities simulating the maxillary sinuses and the nasal cavity and filled with water. The walls, made of thin aluminum and acrylic plates and placed between water and air, disappeared in some CT images. The thickness of the walls calculated from CT values was greater than the true thickness imaged by each CT scanner. The author stresses that in CT images, either experimentally or clinically, thin bony walls placed between water and air or fat tend to disappear, and that bony walls tend to appear thicker than their true thickenss.departmental bulletin pape
Application and Evaluation of Spiral CT in the Diagnosis of Congenital Heart Disease in Children
Full text linkWenjuan Chen, Peng Pan Department of Radiology, Children’s Hospital of Soochow University, Suzhou, Jiangsu, 215025, People’s Republic of ChinaCorrespondence: Wenjuan Chen, Email [email protected]: This study aims to explore the application of spiral CT in the diagnosis of congenital heart disease in children and evaluate its clinical value.Methods: The study included children diagnosed and treated at our hospital from January 2021 to October 2023 as research subjects. After excluding children who did not meet the complete inclusion criteria, a total of 60 cases were finally included. General data of all children were collected and summarized. Spiral CT and echocardiography were performed on all children, and the diagnostic results of both were compared with surgical findings to analyze and evaluate their application effectiveness.Results: Spiral CT detected 39 cases of intracardiac anomalies, 30 cases of abnormal connections of the great vessels, and 66 cases of extracardiac vascular anomalies, while echocardiography detected 33 cases of intracardiac anomalies, 29 cases of abnormal connections of the great vessels, and 43 cases of extracardiac vascular anomalies. Compared with surgical results, the detection rate of extracardiac vascular anomalies (98.59%) and the overall cardiovascular anomaly detection rate (98.54%) by spiral CT were significantly higher than those by echocardiography, with P< 0.05.Conclusion: Spiral CT is a high-resolution, rapid, and safe imaging technique. Compared with traditional echocardiography, it is not only superior in diagnostic accuracy but also faster in imaging speed. It can clearly display the anatomical structure and spatial relationships of lesions, making it of great value in the diagnosis of congenital heart disease in children. It is suitable for clinical promotion and use.Keywords: spiral CT, 128-slice CT, congenital heart disease, diagnosis, application evaluatio
Development of a synthetic phantom for the selection of optimal scanning parameters in CAD-CT colonography
Full text linkThe aim of this paper is to present the development of a synthetic phantom that can be used for the selection of optimal scanning parameters in computed tomography (CT) colonography. In this paper we attempt to evaluate the influence of the main scanning parameters including slice thickness, reconstruction interval, field of view, table speed and radiation dose on the overall performance of a computer aided detection (CAD)–CTC system. From these parameters the radiation dose received a special attention, as the major problem associated with CTC is the patient exposure to significant levels of ionising radiation. To examine the influence of the scanning parameters we performed 51 CT scans where the spread of scanning parameters was divided into seven different protocols. A large number of experimental tests were performed and the results analysed. The results show that automatic polyp detection is feasible even in cases when the CAD–CTC system was applied to low dose CT data acquired with the following protocol: 13 mAs/rotation with collimation of 1.5 mm × 16 mm, slice thickness of 3.0 mm, reconstruction interval of 1.5 mm, table speed of 30 mm per rotation. The CT phantom data acquired using this protocol was analysed by an automated CAD–CTC system and the experimental results indicate that our system identified all clinically significant polyps (i.e. larger than 5 mm)
An Integrated Methodology using Linguistic PROMETHEE and Maximum Deviation Method for Third-party Logistics Supplier Selection
No full text[[abstract]]The purpose of this paper is to present a framework and a suitable method for selecting the best logistics supplier. In general, many quantitative and qualitative criteria should be considered simultaneously for making the decision of logistics supplier selection. The information about judging the performance of logistics suppliers will come from customers' opinions, experts' opinions and the operational data in the real environment. Under this situation, the selection problem of logistic suppliers will be the uncertainties and fuzziness problems in the decision making process. Therefore, we combined the linguistic PROMETHEE method with maximum deviation method to determine the ranking order of logistics suppliers. And then, an example is implemented to demonstrate the practicability of the proposed method. Finally, some conclusions are discussed at the end of this paper.[[note]]SC
Differentiation of ketamine effects on renal nerve activity and renal blood flow in rats
No full textFull Color Light-Emitting Electrospun Nanofibers Prepared from PFO/MEH-PPV/PMMA Ternary Blends
No full textHighly-Aligned Electrospun Luminescent Nanofibers Prepared from Polyfluorene/PMMA Blends: Fabrication, Morphology, Photophysical Properties and Sensory Applications
No full textDynamic changes of touch- and laser heat-evoked field potentials of primary somatosensory cortex in awake and pentobarbital-anesthetized rats.
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